navigator.userAgent.split(' ')[11].split('/')[0]

//gets the type of browser

function detectBrowser() { 

    if((navigator.userAgent.indexOf("Opera") || navigator.userAgent.indexOf('OPR')) != -1 ) {

        return 'Opera';

    } else if(navigator.userAgent.indexOf("Chrome") != -1 ) {

        return 'Chrome';

    } else if(navigator.userAgent.indexOf("Safari") != -1) {

        return 'Safari';

    } else if(navigator.userAgent.indexOf("Firefox") != -1 ){

        return 'Firefox';

    } else if((navigator.userAgent.indexOf("MSIE") != -1 ) || (!!document.documentMode == true )) {

        return 'IE';//crap

    } else {

        return 'Unknown';

    }

} 

// You aren't actually sure what browser they have but you have data on it. I guess

// you could return it and then find it out using 'if' and 'else if' statements

// Anyways, here you go:

​

// We want to alert the user about what their current browser is.

// We can use the navigator object to get the user's browser.

​

// Create a variable called browser and set it to the user's browser.

// Then alert the user what their browser is.

const browser = navigator.userAgent;

alert(browser);